<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        /*       接收用户输入的用户名和密码，若用户名为 “admin” ,
                  且密码为 “123456” ,则提示用户登录成功!  否则，让用户一直输入。 */
        let user1 = '';
        let password = '';
        // let i = 1;
        while ((user1 != "admin") && (password != "123456")) {
            user1 = prompt("请输入用户名");
            password = prompt("请输入密码");
            if ((user1 == "admin") && (password == "123456")) {
                console.log("登录成功");
                break;
            }

        }
    </script>
</body>

</html>